Photographic plate or film for the investigation of bodies or substances by means of neutrons



April 13, 1943. I l 2,316,595

HARTMUT lsRAl-:L KALLMANN, FoRMl-:RLY

- KNOWN AS HARTMUT KALLMANN, PHOTOGRAPHIC PLATE OR FILM FOR THE INVESTIGATION OE' BODIES OR SUBSTANCES BY MEANS OF NEUTRONS Filed March 16, 1939 WWII/III),

Patented Apr. 13, 1943 PHOTOGRAPHIC PLATE OR FILM FOR. THE

INVESTIGATION OF BODIES OR SUB- STANCES BY MEANS OF NEUTRON S Hartmut Israel Kallmann, formerly known as Hartmut Kallmann, Berlin-Charlottenburg, Ernst Kuhn, Berlin, and John Eggert, Leipzig. Germany; vested in the Alien Property Custodian Application March 16, 1939, Serial No. 262,306 In Hungary March 23, 1938 1 Claim.

Bodies or substances including for example living tissues, which scatter or absorb neutrons, may be investigated by mean's of neutrons, and preferably by means of slow neutrons (that is to say neutrons the de Broglie wave of which is of modiiied embodiments of the invention. approximately equal to or larger than the diam- In the gures, 2 represents a photographic eter of the nucleus of the substance being examemulsion and 3 represents a supporting layer. In ined) by exposing the substance to the neutrons Fig. 1, l is a layer comprising a substance capaand causing the neutrons which emerge from the ble of reacting with neutrons to produce charged substance to act on a layer of a material in 1o particles, for example, a substance containing which a reaction takes place in which are prolithium or boron atoms, and a binder soluble in duced heavy charged particles, or positively or a solvent which does not affect the photographic negatively-charged electrons, the heavy particles emulsion or in the liquids used in the photoor electrons being caused to act on an adjacent graphic development process. photographically-sensitive layer directly as de- In Fig. 2, 4 is a layer similar to layer I of Fig. 1 scribed in the specification of application No. but containing also a fluorescent material. 197,929, now U. S. Patent No. 2,186,757, or on a In Fig. 3, I is a layer similar to layer l of Fig. photographically-sensitive layer associated with 1, and 5 is a layer comprising a fluorescent maa uorescent material as described in the speciterial and a binder having the same properties iication of application No. 197,928, now U. S. as the binder of layer l. Patent No. 2,188,115. Having now particularly described and ascer- According to the invention the intermediate tained the nature of our said invention and in layer that gives off the heavy particles or the what manner the same is to be performed, we electrons, or the fluorescent material or both is declare that what we claim is: Y or are applied to the photographically-sensitive A photographic plate or lm for use in the layer in the form of a liquid which is allowed to investigation of materials by means of neutrons set, the liquid comprising tne intermediate layer comprising a supporting layer, a layer of photoor the fluorescent material suspended in or mixed graphic emulsion on said supporting layer and with a binder which dissolves in solvents which a layer comprising a substance capable of reactdo not have an adverse effect on the photographing with neutrons to generate charged particles ically-sensitive layer and its support or in any and a binder substance, the binder substance liquid which the photographic layer is treated being soluble ina liquid Capable 0f developing the with during the whole photographic process sumphOtOglaPhiC layermarized as development, of reducing the activated compounds of silver and/or of dissolving the HARTMUT ISRAEL KALLMANN.

nonactivated compounds of silver.

The invention will be more particularly described with reference to the accompanying drawing in which:

Fig. 1 is a diagrammatic representation of a photographic plate or lm embodying the invention; and

Figs. 2 and 3 are diagrammatic representations Formerly known as Hartmut Kallmaun.

ERNST KUHN. JOHN EGGERT. 

